Jardur Valjoux 22 from late 30s/early 40s with waterproof/ermetic case

I recently acquired a nice Jardur most likely from the late 30s or early 40s with a Valjoux 22 movement.
It has a very unusual dial in white with tele- and tacho-/tachymeter scale (Jardur/Prilgrim served US market so it’s in miles) marked “swiss made” at the bottom divided by the “120” tachymeter scale.

There is no reference or serial number engraved in the caseback. Only a manually added number beginning with 34 inside the caseback (what could be a 5 digit serial or stock number).
Case is…

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Is this a Spillman case? 22409

I finally found the Big Brother for my Berthoud 22409.
The UG 22409 belonged previously to a japanese UG collector but was sold by a watch store – according to serial number it should date to around 1945.
It measures 38mm and has the HOX US import stam…

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